First post, and I'm sorry it's the usual "help with new headphones" variety but I've looked through here and just had trouble deciphering the huge amount of info in this great forum.
 
Here is some information about me and what I am looking for...
 
Price range: preferably less than $100 USD
Style: Over-the-Ear, probably closed but might consider open back, on ear only if they are super comfortable
Source: almost always an iPod or iPhone with no external amp, though at times would run them through my Onkyo TX-SR607 receiver
Genres: I listen to Rock, Hip-Hop, Country, Classical, Jazz, Electro and Dubstep, Singer-Songwriter
Sound: I'm looking for something flat enough to enjoy Classical/Jazz/Country, but with enough clean bass to enjoy Hip-Hop and Dubstep, and with highs that aren't fatiguing when I listen to Rock and Electronica
Comfort: I am bald so there is nothing between me and the headphones so comfort is important to me as well
Portability: Will mostly listen to them at home, but something with good portability would definitely be a bonus
 
I think my biggest problem is that I listen to so many genres on a regular basis. It isn't too difficult to find good bass heavy headphones or good studio headphones, but I seem to be looking for something in between. If the best answer is to buy two different $40 headphones that might be an acceptable option but I would prefer one good set that won't disappoint me regardless of what I'm listening to. Of course anything would be a step up from what I usually use now, which is just the basic iPod buds that come with the unit. I hope I gave enough info for some good recommendations and I look forward to your thoughts. Any input is a gift and greatly appreciated.

No suggestions at all?

Best suggestion is probably UE 6000. Another option with a bit more bass is skullcandy aviator. Those are the two i can think of right off the top of my head that are quite good headphones at below 100

http://www.vminnovations.com/Product_50177/Sennheiser-HD-439-Around-The-Ear-Portable-Headphones-Refurbished-.html

I find the 439 a bit veiled sounding. But for 50 cant rly complain

Yeah, my thinking was that for under $100 there is going to be some compromises somewhere, and at least for me, I would rather have a comfortable 'phone with a top end that is a little veiled rather than a fart-cannon bottom end.

Other options might include the Creative Aurvana Live, Sennheiser HD280 Pro, Sony MDR V6, Shure SRH440, Logitech UE6000, Sony MDR-10R

Some of those are currently pretty deeply discounted to get them under $100. I'm not sure if that is temporary or if they are soon to be discontinued. In any case, there's lots variety of sound in just those big name options.

Thanks folks. Billybob, I agree. Better to lose a little from the top than have crappy bass and too much of it. I definitely want a clean sound and I'm sure all of those 'phones you listed are infinitely better than what I'm used to. After reading up on the ones you listed I think I'd be most interested in the CALs and the UE6000. I don't really need the noise cancelation at all though so leaning toward the CALs. I've also thought more about my listening preferences. While I listen to all of those genres on a regular basis, I'd be most likely to put on the headphones for Classical and Singer/Songwriter type stuff more often than the other genres. But I'd still like to enjoy some Hip-hop and Dubstep/Electronica at times as well. Might pull the trigger on the CALs here in a few weeks unless anyone has more recommendations or thoughts. Thanks again to all who replied so far.